Locomotive



Nl/EA/ T012 4 Sheets-Sheet l P. G. ROBINSON LOCOMOTIVE Filed Novv 18.1926 .NSN

Nov. 8, 1927.

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P. G. ROBINSON LOGOMOTIVE 4 Sheets-Sheet 5 Filed Nov. 18. 1926 Nov. 8,1927.

P. G. ROBINSON LOCOMOTIVE Filed Nov. 18, 192e 4 sheets-sheet 4 Nn mwNNN.

Patented Nov.` 8, 1927.

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LOCOMOTIVE.

Application sied November is, 192e, sel-iai No.

`This invention relates to locomotives and hasy reference to locomotivesadapted to be driven by internal combustion engines and particularlythat type of engine, where steam isused expansively at the backs of thecombustion engine pistons, although an independent set of steam or aircylinders may be used in combination with the internal combustion enginewhich'engine may be of the conventional type operated wholly by theinternal combustion of carbonaceous fuels.

4The present invention comprises a locomotive having in the powertransmissionmechanism oppositely disposed pairs ofpower cylinders havingusual or coaxially coupled piston` rods connected to a common crosshead`which is connected by a linkage to the upper end of a rocking beam ofwhich the lower end is connected to the small end of a substantiallyhorizontal connecting rod of which the large end is on a crank ofthemain driving wheels or axle. rlhe cylinders are preferably so arrangedthat their weight will be located within the fixed wheel base.

Each of the outer and oppositely disposed engines is of the'internalcombustion type, and may be constructed to operate on the two strokecycle principle, and in the preferred form are of the Still engine type.i

The use of internal combustion engines of considerable power involvesthe use of heavy reciprocating'masses a feature particularlyobjectionable in locomotives. In internal combustion engines providedwith scavenging blowers arranged parallel to the cylinders the presentinvention enables such objection to be remedied bydividing the weight ofsuch masses into two portions which are connected to a rocking beam insuch a mann ner as to move in opposite directions to one anothersimultaneously, one portion of these reciprocating masses consisting ofthe main pistons, piston rods, crossheads and connecting links of theengines, and the other the main connecting rod and the piston andconnecting link of the blower.

Another advantage of the use of oppositely disposed cylinders, is thatby connect ving the oppositely disposed piston rods to a commoncrosshead allthe bearings of the transmission mechanism-will be loadedalternatively in opposite directions.

IAn embodiment of the invention is illustratedl by the accompanyingdrawings wherein Figure 1 is a central sectional ele- 149,221, and inGreat Britain ctober 16, 1925.`

ration of a general view of the locomotive, Figure 2 is a .partlyAhorizontal sectional plan of Figure 1,: Figure 3 a partly sectional end-view of Figure 1, Figure 4L is an end view of the fuel injectionmechanism, Figure is a sectional view ythrough'na fuel injection` pump,Figure 6 a horizontalsection of Figure 5, Figure a' sectional view`through the fuel panna casting at thev cam shaft, Figure 8 is a` sideview partly in section illustrating the valve mechanism,F ignre9 apartial. section and plan viewfof Figure 8. and Figure 10 an end'view ofportion of Figure 8.

ln these drawings the locomotive has three sets or pairs of cylinders,2, 3a, 2b, 3" and 2c, 3 arranged horizontally and side `by side abovethe driving wheels fi and '5 so that their weight is supported wholly orprincipally by such driving wheels, it` being of primary importance toconcentrate asmuch ofthe weight'as possible within the fixed wheel base.The piston 6 of the cylinder 2a' and also that of the cylinder 3a havetheir rods 7 and 8 attached to a single crosshead 9 sliding in a guide10, the crosshead 9 being provided with trnnnion pins 11 whereby it isconnected'by links 12 and 13 to similar trunnions` 14 at the upper endof a rockingx beam 15. The upperend of the rocking beam 15 is perforatedvat 16A in such a 4manner that the piston rod 8 will slide freelythrough it at all inclinations of the rocking beam.

The rocking beam 15 is provided with fulcrum trunnions 17 mounted inbearings 1x8 on a casting 25 on which the `cylinders are mounted yandwhich is fixed on the main frame 26 of the locomotive. The lower end areproportioned according to the strokeof the piston and thepath'of thecrank pin 22.

A steam generator orboiler 3() is provided conforming in generalappearance to the boiler of an'ordinary steam locomotive and this boileris separately fired for starting'u'p and overload purposes and also ifdesired lll) for the generation of steam forfnormalrun- Llil ning. Suchboiler may however be either partly or wholly heated by the exhaustgases from the internal combustion engine. For this purpose the exhaustproducts trom the internal combustion engine cylinders are conveyedthrough separate banks ot tubes in the boiler. rl`he exhaust from the`steam side ot the engine may be utilized in the conventional manner torthe production ot a draught through the tubes.

The cylinders operate on the two-stroke cycle and below them arearranged scavenging blower cylinders -l-O and scavenging air passages 1Gleading therefrom to the combustion cylinders. Each blower cylinder l0has a piston Ll1 oit which the trunk 4t2 is connected by a joint with aconnecting link et ot which the other end is connected by a pin Ll5 withlower arm ot the rocking beam 15. Any suitable tuel injection device maybe provided at lllhere three rocking beams are used and diiiiculty isexperienced in accommodating a blower between the trames, such blowermay be dispensed with as the central rocking beam does not requc to beso completely balanced as the two outside beams because oit its centralposition relative to the engine trame.

A form ot fuel injector pump mechanism suitable 'for the locomotiveillustrated by Figures 1 to 3 is illustrated by Figures 4; to 7.

The tuel injection pumps L19 are divided into two groups each consistingot three pumps arranged in plan at 501 and 50C each group being drivenby a rod 51 connected at its lower end by a pin 53 to a guioe link 511sliding on a crank-slide 55 attached to a rocking beam 15 and arrangedto be adjustable by suitable means, as a screw and nut 56 tor varyingthe crank travel. The upper end ot the rod 51 is connected by a pin 57to one end ot a lever 58, the other end ot the lever 58 being lined to ashatt 59 on which are fixed three pairs of pump cams 60.61.

The reversing of the pumps is etlected by employing` two cams 60 and G1for each pump one tor forward ruiming and the other tor backwardrunning. Each pump plunger 6B forced outwards by spring 65 and inwardsby a lever (36 pivoted at G8 to the pump trame 67 and carrying a roller69 adapted to be engaged by either the cam G0 or the cam 61 during therocking ot the shaft 59 by the lever 58 trom the rocking beam 15. Theforward or backward cam is brought into line with the pump plunger 6B bymeans ot a single control lever 601 mount-- ed loose upon an extensionot the cam shaft 59. The lower end ot the control lever 611 is formed asa quadrant provided with a peripheral groove 7() as shown by the ad-]acent projection oit this end of the lever in i The groove TO cngagrs aroller yfed on a cam traversingr sh cams 60 and 61 being lined to rsleeve 3 sliding on splines 'le on the sha1-t o9. lever (3l is alsoconnected by a link 75 and arm to a cam roller lifting shaft 7G.

"ln the operation ot this mechanism during a partial movement oft thecontrol lever 64. trom position ll to position ll the main cani engagingroll 69 are litted clear of the cams 60 and 61 by the cams 34 on theshaft TG, and ,tui-ther movement ot the lever 64e to position lll slidesthe sleeve 73 carrying the cams (50 and 61 along the shalt 59, and

tie conipletion ot the movement of the lever .lto position lil allowsthe rollers 69 to 'dei the cams 60 and 61 brought into ine therewith bylthe inclined portion of the roove 70.

as shown in Figures 8 to 1() each of the combustion exhaust control orsupereharg ing valves 92 operated by means ot an arm 1207 link 121,bell-crank lever 122 and link 123 trom a lever or arm 9?) secured on theshaft of the steam gear radius link Sleiwliich provides a movement ot900 tor these valves to the main cranks 22, the radius link 94; beingoperated Yfrom a crank pin 124e by a connecting rod 125. rlhe radiuslink is carried by a bracket 126 secured to the supporting casting 25 otthe engine cylinders.

rlhe reversing ot the valves 92 is etl`ected by means ot the bell-cranklever 122 which rocks on the pin 12S oit a crank 129 of the sha'tt 127which is a reversing shaft operated by a lever 130 and link 131connected to the operatingmechanism. rlhe lever 130 is also connected bya link 32 to the lever 641- o't the fuel pun/lp mechanism. By reason ofthe crank 129 the valves 92 have two closed positions, one at a :torbackward running and the other at Y) tor forward ruiming. Thecorresponding valve to on the opposite cylinder ot the pair is operatedby a rod connected at one end by a pin 181 to an en tension 162 ot thebell-crank lever 122 and at the other by a pin 1653 on the operating armot the opposite valve. Y

ln the example illustrated the internal combustion engines are ot thekind using steam on the opposite side ot the piston to that on whichcombustion takes place. the steam valves 132 control steam from theboiler admitted through the pipe ll/t. and exhausted through a pipe 137.The steam pipe 124 loads to passage 147 (see Figure 9). 141-6 beingthesteam and exhaust port of the steam Side of the cylinder. Y

The steam valves 132 are controlled and operated b v a modified term ofllvlalschaert gear (see Figure 8) of which the radius link 138 isconnected by a link 140 and levers 150 and 151 to an operating controlrod 152. ln this gear the admission of steam to the cylinder betere thecrank reaches its dead. centre is provided for by a suitableproportioned lever 136 connected by a pin 17 to the link 138 of thelValschaert gear. The lever 136 rocks about a fulcrum pin 139 fixedeccen trically on the fulcrum shaft 17 of the main rocking beam 15. Therocking lever 136 is connected at its upper end by a pin 112 to a valverod 153 of the steam valves 139J arranged at its opposite ends.

Steam is also admitted vto the combustion side of the piston forstarting purposes from a steam supply pipe 135 to a steam valve 133arranged co-axially with and driven by the main steam valve 132. Thevalve 133 admits steam to the internal coi'nl'mstion end of the cylinderthrough a pipe 1118.

In the example shown, the mechanism for producing the effect ofsupercharging comprises a valve controlling the last period of theexhaust. ln some instances, however, supercharging is .effected bycontrolling the timing period of admission of the scavenging air. Wherethe latter method is adopted the interlocking with the fuel pump reversegear may equally `well be effected, thus the terms exhaust orsupcrcharge control used herein are to be regarded as alternative.`

lVhat I claimy and desire to secure by Letters Patent is 1. A locomotivehaving in its power transmission mechanism oppositely disposed pairs ofpower cylinders having coaxially coupled piston rods connected to across-head, a rocking beam, a linkage connected to the upper end of therocking beam and to the cross head the lower end vof the rocking beambeing connected to one end of a connecting rod which is attached to acrank for the main driving wheels. Y

2. A locomotive in accordance with claim 1, wherein the weight of theintermediate cylinders is concentrated within the fixed wheel base.

3. A locomotive in accordance with claim 1, wherein the oppositelydisposed cylinders of each pairrare the cylinders of internal combustionengines.

4f. A locomotive in accordance with claim 1, wherein the oppositely'disposed cylinders of each pair are the cylinders of two-stroke cycleinternal combustion engines giving power strokes alternatively.

5. A locomotive in which the power mech anism comprises longitudinallyand oppo sitely located outer pairs of power cylinders, piston rodstherefor connected to driving wheels of the locomotive, a driven crankshaft associated with the driving wheels, an intermediate pair of powercylinders posi* pairs of power cylinders, and a rocking beam connectedwith the piston rods of said intermediate cylinders and with the saiddriven crank shaft.

6. A locomotive in accordance with claim 1, wherein the piston rods ofalined cylinders pass through openings in the rocking beams fulcrumedbelow the cylinders.

7. A locomotive having oppositely disposed pairs of outer powercylinders, piston rods for said cylinders, means forrconnecting thepiston rods of the outer cylinders with the driving wheels of thelocomotive, an intermediate pair of power cylinders, a rocking beam,means for connecting the rocking beam with the piston rods of thecylinders, a shaft for the driving wheels of the locomotive, anintermediate crank on the shaft, and means for connecting the crankportion of the shaft with the lower end of the rocking beam.

8. A locomotive having longitudinally and oppositely located outer powercylinders, a pair of power cylinders located between said outercylinders, pistons and piston rods for the cylinders, crank shafts for apair of driving wheels of the locomotive, means for connecting saiddriving wheels with the piston rods of the outer cylinders, a rockingbeam connected with the piston rods of the inner power cylinders, meansfor connecting such rocking beam to one ofthe driving axles, fuel pumpsoperated by forward and reverse cams operating on a roller carryinglever engaging directly the plungers of the pumps, characterized in thatthe forward and reverse cams are moved axially along utheir shaft by themechanism connecting the exhaust control valve operating lever with thereversing mechanism.

9. In a power transmission mechanism for locomotives, oppositely'disposed steam and internal combustion power cylinders, pistons andpiston rods therefor, cross heads to which the piston rods of thecylinders are attached, rocking beams, linkage for connecting the crossheads with the rocking beams, and linkage connecting the lower ends ofthe rocking beams with driven axles of the locomotive.

10. A locomotive in accordance with claim 5 wherein the steam valveshave attached to, their spindle an auxiliary steam valve admitting steamto the combustion side of the pistons for starting purposes.

In witness whereof I aiix` my signature.

PERCY GRIERSON ROBINSON.

